q+d=15
.25q+.10d=2.70
d=15-q
.25q+.10(15-q)=2.70
.25q+1.50-.10q=2.70
.25q-.10q=1.20
.15q=1.20
q=8
q+d=15
8+d=15
d=15-8
d=7
d stands for dimes
q stands for quarters
if you have 15 coins in a bag and their total amount is $2.70 how many quarters and dimes are in the bag? Use substitution to solve
1 answer
1 answer